Alveoli in the porous membrane (IMAGE) Uppsala University Caption The porous membrane contains cavities or alveoli which are assumed to shaped by enzymatic activity by exosomes (One-exosome-like body is shown in higher magnification in the inset). Authors believe that these alveoli may increase the sensitivity of the hairs and thereby improve the crocodiles´ hearing. Credit Uppsala University Usage Restrictions Credit must be given to the creator. No derivatives or adaptations of the work are permitted. License CC BY-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.